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6c9e3c9551
We can get CompactionError::Other(Cancelled) via the error handling with a few ways. [evidence](https://neon-github-public-dev.s3.amazonaws.com/reports/pr-8655/10301613380/index.html#suites/cae012a1e6acdd9fdd8b81541972b6ce/653a33de17802bb1/). Hopefully fix it by: 1. replace the `map_err` which hid the `GetReadyAncestorError::Cancelled` with `From<GetReadyAncestorError> for GetVectoredError` conversion 2. simplifying the code in pgdatadir_mapping to eliminate the token anyhow wrapping for deserialization errors 3. stop wrapping GetVectoredError as anyhow errors 4. stop wrapping PageReconstructError as anyhow errors Additionally, produce warnings if we treat any other error (as was legal before this PR) as missing key. Cc: #8708.